Raspberry Pi is mostly known for its tiny, cheap, single-board computers that are widely used by hobbyists and schools, as well as industrial and electronics manufacturing companies. The Raspberry Pi 5, the company’s flagship product, features a PCIe 3.0 interface exposed with a 16-pin connector.

The company has been selling M.2 HAT+ extension cards that convert the 16-pin connector to a more traditional M.2 connector. HAT stands for “Hardware Attached on Top”, a cute acronym the company has been using to refer to extension cards that you attach to a regular Raspberry Pi.